I habe a vw thing 1975 , I wish to lower it a little bit , not slammed but low as much as a beetle would be with one tooth at the back.

How can I lower the FRONT ? And how do I lower the Back ? Is it same as a beetle from the rear with 1 "tooth" ?

Also, I would like to increase some power , I want to use stock gearbox , whats the best engine to put to get some power to get off fastest ?? Dont want a race car , jist some power to enjoy it on summer days, wont use it for long distances , no highways in my country ..

Lowers just the same way a bug would.
If you fit bug front spindles that will give you a nice drop around 4inches I think , rear is just a case of re-indexing torsion bars as you say 1 tooth etc
Engine wise a 1776 with a set of twin 40's and a decent exhaust will give you a nice little boost over stock without breaking the bank

Swap the front with bug spindles and you can keep your drums. If you want to go fast, swap the spindles with Ghia spindles. That way you can use disc brakes. Don't get aftermarket ones, get some late German ones.

If you go that route, you'll have to flip your lower front trailing arms. Or you can buy some bug ones and pop them in. I'd do that because you can then sell your lower arms and spindles for a pretty penny to someone making a baja bug._________________'69 Bug'68 Baja Truck'71 Bug